Hemstitch sewing-machine.



M. HBMLEB.

PAT-ENTED APR. '7, 1908.

HEMSTITGH SEWING MACHINE:`

Arrmomlo rILnn conf/.1901.

v:a ann-SHEET 1.

` @WW/besace PATENTE-D APP.. 7, 1908.

MIHBMLEB.

HEMSI'ITGH SEWING MACHINE.

APPLICATION FILED 0017.190?.

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3 SHEETS-SHEET 2.

y BATBNTBD APR. 7, 190s. M. HEMLBB.

HEMSTITCH SEWING MACHINE.

APPLICATION FILED 00T. 7. 1 907 3 BHEETB-BBEET 3.

mi .WM

crum-pin 21.

-inder 27, im arts vibratory movements to per end of a vibrating lever 47 having its offset lower end fixed to the needle-clamp ful.- The rotation of the cam-cylthe lever 34W 'ch are communicated through the link 40, guide-pin 41, lever 47, and needle-clamp 22, to. the needle 24, Whose lateral ovements are in a direction transverse to the path of rotation of the beak of the looptaker at the loop-taking position.-

The block 20 at the lower end of the needlebar is provided with a lateral ear L18 to which is fitted the transverse channel 49 in an'ear 50 of the awlcarrier 51 having vertical sockets entered by the offset Shanks oi" the awls 52 secured therein by means of clamp'- screws 58, the awl-carrier 51 being secured adjustably in place by means of a`clampscrew 54. The awls 52 are shown herein arranged in line with the needle in one of its lateral positions, and are spaced respectively a stitch-length in front of and behind the same, and are adapted to be adjusted toward and from the needle by turning in their respective sockets in the carrier 51 to conform with the adjustment of the feeding mechanism.

The 4feed-dog 55 is mounted upon the usual Afeed-bar 56 pivotally coiinectedat one end with the vertical arms 57 upon the forward end of the rock-shaft 58 joiirnaled beneath the bed-plate and provided at its rearward end with a crank-arm 59 pivotally connected wit-li the lower end of a link-bar 60 fulcruned near its upper end upon a pin 61 at one end of 'a link 62 pivoted at 63 to one arm of the feed-adjusting angle-lever 64A fulcrunied at' the junction of its arms upon the bracketarm and having its other arm provided with a thumb-screw 65; the u per extremity of the link-bar 60 being forlied to embrace a block having' a perforation entered by a lateral in 67 upon the transversely reciprocating slide-member 68. The slide-member 68 is provided at one end with a pin 69 enterin 'a guiding socket 70 in the bracket-arm an forked at its other end to embrace a guideblock 71 mounted upon the shaft 28; the

slide-member 66 having a laterally projecting roller-stud .72 entering a carnroove 73 in the rearward face of the cam-cy inder 27. rThe laterally. reciprocating movement of the slide-member 68 derived from the camgroove 73 operates through the link-bar 6() and rock-shaft 58 to communicate to the feed-dog the to-aiid-fro work-shifting orfeeding movements transverse to the lateral movements ol the needle.

rlhe end of the feed-nar opposite that connected with the rocker--ariiis 57 is forked to embrace the usual roller-stud carried by a crank-arm 75 mounted upon the feed lifting rock-shaft 76 journaled beneath the bedplate and provided with spaced lateral arins 77 intermediate. which is pivoted the lower eeaere end of a link 7S pivotally connected at the up ei' end with a depending ariii 79 of an an- -gu ar lever i'ulcrunied at S0 iipoii the bracketarni and provided with a lateral arm S1 havingr a ro ler-stud S2 which enters a canigroove 83 in the forward tace of the cani-cylinder 27; the cani-groove S3, through the link 78 and rock-shaft 76 controllingf the rising and falling movements of the feed-bar, and hence of 'the feed-dog between which and the presser-foot 84, of usual or welllateral lug 89 upon the top of the bobbincase, whereby t e latter is prevented from rotation with the hook by wbich'the same is su ported. `T he throat-plate isr also provi ed with a transverse needle-slot 90 and with awl-holes 91 forward and rearward of the same to receive the awls 52.

As herein represented, the loop-taker shaft is provided with .an eccentric 92 embraced by aV yoke 93 upon a rock-shaft 94 mounted in the loo -taker shaft supporting bracket and provi ed with an arm 95 carryingr a bobbin-case shifting finger 96 engaging alaterally projecting shoulder 97 upon the bobbincase, whereby the latter is turned in op ositionlto the hook to relieve the pressure o the lug 89 against the forward wall of the notch 88 in the thioat- )late to release the needlethread loop cast a out the bobbin-case in the production of each stitch.v

To insure the proper cooperation of the needle with the loop-taker, an arm 98 ixed.

to the under side ofthe bed-plate is extended into proximity with the needle path, where it .is provided with a guiding notch 99 to re- As represented in Fig. 1, the needle 24 is in thevpositioii which it assumes as itis about to penetrate the hein ofthe material, being parallelwith the axis of `the needle-bar 15 and the awls 52, and in `operative relation with the path Vof movement of the beak of the hook in whichl position it presents its loo s of needle-thread to the latter.

'flic operation of the several co erative parts o f the stitch-forming and fee( ing-devices is substantially the same in the present improvement in machines heretofore constructed, and is briefly as follows:-'l`he needle iirst descends in its outer position, with tbejpoint substantially' in line with the awls 52. After the needle has penetrated the goods, the lever 47 is shifted to the left so as to bring thc needle to the right and into iioressere means of the take-up, Before the next descent of the needle the forward feeding moveinentis eli'ected, and the needle being shifted into the hem penetrating position, represented in Fig. l, descends and presents a second loop `for seizure by 'the loop-taker and @the second stitch is pr duced. A third stitch is produced after a second forward feeding movement of the goods, with the needle movements similar to those of the Jfirst stitch, after which a feeding movement is elected preparatory to the repetition or" the series of three stitches with intermediate feeding movements. The lateral move-- ments of the needle while in the material in the production of the stitches ol'l the hein not only serve to enlarge the needle-hole to crowd the threads of the body material toward the edge of the hein, but enables the needle to present its loop to the beak of the hook invariably at the same ,oint so as to insure against skipping of stitc ics.

i prefer to have my loop-taker driven by e vert-ical shalt geared to the longitudinal shalt rather then driven directly by the longitudinal shaft itself, as is common in sewing machines ior stitching in `general, including lienistitching, for the reason that by having the loop-taker so arranged my machine is capable of being employed either for making e, single or a double henislitch. When used for the single lien'istitch only one loop-taker will be employed as shown in the drawings. But il the double. hemstitch or spoke-stitch is desired, the loo -talrer may be duplicated von the op fiosite side ol the needle because clipable or being mounted upon s, separate vertical shaft; a space being shown provided in the frame of the machine et lill), represented iii Figs. i and t2. Y

.ll-ii the iccompaiiyinel drawings l have shown the awl carrier provided with two au'ls disposed, respectively, in advance and rearward ol the needlefivliich is desirable in certain classes of work to insure the. Formation oi holes ol the requisite size oil' the hem, but .in some instances only one avvl is `cm loyed, in which case the forward a-wl is usueJ ly dispensed with, and the rearward awl onlyv is employed to complete the enlargement ol the hole formed by the needle` From the foregoingr description it-will be observed lthat the present improvement inchine.

volves ay combination ol certain constructive features which, while not individually new,

are for the first time so 4associated together as to produce a high-speed,hemstitch ma- Une of the essentials involved in the accomplishment of this result is the adaptation to hemstitcli mechanism oi" a loop-taker capable oi Aeilective cooperation. with the needle at a high rate oi speed, combined with actuating mechanism therefor deriving its operative movements directly from the inamshiift and entirely unloaded by other moving cita parts oi the machine for which such class or" mechanism has heretofore been generally used.

So lar as i am aware, the present is the lii'st time in which a rotary loop-taker actuating shaft driven by the main-shaft has ever been used in hemstitclimachines entirely unloaded hy the leed or other actuating mecha. in; as also the first instance in a lieinslitch inachiiie in which a rotary loop-taker has been given a plurality ol rotations to cach reciprocation of the needle through the insti'uiiieiitality of :i rotary actuating shaft driven from the main-shalt and eillirely unloaded with mechanism lor actuating other operative parts. y v

One forni oi the development ol' the principle of this invention is shown in niy apilication liled December 20, 1907, Serial No. 407,413.

Having; thus set forth the nature oip the invention, what l claim herein is:-

1. A. hemstitch seivinp,r machine comprising a ironie including a bed-plate and an overhanginiT bracket-arm, einem-shalt pini*- neled in said bracket-arm, s. rotatingr iooptalrer shaft journaled beneath the bed-plate, a loop-taker mounted upon said loop-taker shalt, speed accelerating actuating mechanisni connected with and drivenhy the insinshett and adapted to impar'. to the tllier shalta plurality of rotations for each rotation o'l the main-shaft, s reciprocating; and laterally movable needle ade. )ted to cooperate with said loop-taker inl` ie production oil stitches, ieedinp; mechanism for shillint@ the work in relation to the stitch-forniingl mechanism, and connections intermediate the mein-shaft and the needle end iced mechanisms whereby reciprocatory and lat-- eral movements `are imparted to the nccdli and operative movements are imparted to the feed mechanism, said connections being independent of the actuating mechanism l'or the loop-taker. y A

2. A henistitch sewing machine, comprising a'. frame including a bed-plate and :in overhanging bracket-arm, a main-shalt ioni'- nrded iii said lnaclietearni, a loop-'tfihci, e. rotarysha-l't therefor mounted in 'lined bearings beneath the bed-plate and secured l'roni endivise movement, speed acceleratingy actuating mechanism connected with and driven by thc main-shaft and. adapted to impart to the loop-taker shalt a plurality of rotations for each rotation of the main-shoft,- a needleb'zir mounted in ixed bearings iii said bracketarm, means connected with said main-shalt for reciprocating seid needle-bara, e needlecarrier niovsbly Vmounted upon said needlebar, a needle mounted in said needle-carrier and movable with the same laterally toward and awa-y from the path of movement of the point of said loop-taker, an aval carried by said needle-bar and disposed rearward of loopsaid needle, feeding mechanism operative in a direction transverse to the plane of lateral y movement of said needle, a cam mounted on vrotary shaft therefor mounted in Xed bearings beneath the bed-plate and secured from endwise movement, speed accelerating'actu-v ating mechanism connected with and driven by the main-shaft and adapted to. impart to the loop-taker shaft a plurality of rotations for each rotation of the main-shaft, a lneedle-- bar mounted infixed bearings in'said bracketar'm, means connected with said main-A shaft' for reciprocating' said needle bar, a needle carrier movably mounted u on said needle-bar, a needle .mounted in sai needlecarrier and movable with the same laterally toward and away from the path of movement of the )oint of said loo -taker, an awl carried by said needle-bar anc disposed rearward of said needle, feeding mechanism o erative' in a direction transverse to the p ane ol lateral movement of said needle, a cam mounted on the bracket-arm 'of the machine with its axis of motion parallel with the main-shaft, and connected with the latter bymeans of intel-meshing spurgears to impart to said cam rotations at one-third the speed of the main-shatt, and connections from said cam to the needle-carrier and'to the feeding mechanism for4 imparting lateral movements to the needle-carrier and operative movements to the feedinlr mechanism^ 4. A hemstitch sewing machine, com rising a frame including a bed-plate an an overhanging'bracket-arm, a main-shaft journaled'in said bracket-arm, -a loo -taker, a rotary shaft therefor mount \d in. ixed bearings beneath the bed-plate and secured from endwise movement, speed accelerating actuatin mechanism connected with and driven by t e main-shaft and adapted to impart to the loop-taker shaft a plurality ol rotations for each rotation of the main-shaft, a needle-bar mounted in fixed bearings in saidA bracketarm, means connected with said main-shaft for reciprocating said needle-bar, a needle.-

essere' carrier pivotally mounted upon and movable with said needle-bar, a needle mounted in saidi carrier vand movable with the same laterally toward and away from the path of inovev ment of the point of said loo i-taker, an awl carried by said needle-bar anc disposed rearwardv of said needle, feeding mechanism o Grat-ive in a direction transverse tothe p ane of lateral movement of said needle, Aa A cam-carrying coimtershaft mounted on the bracket-arm, a cam-upon said cam-shaft, gearing intermediate the main-shaft and said cam for producing the rotation of the latter at one-third the 'speed of theformer, 70 and connections from said'cam to the needlecarrier and to the feedingv mechanism for imi partingoperative movements to the same. 5. Alhemstitch sewing machine, corn ris'- ing a frame includin overhanging bracket-arm, a main-shaft journaled in said. bracket-arm, a loc -taker, a rotarv shaft therefor mounted in ed'bearingsbeneath the bed-plate and secured from endwise movement, speed' accelerating ac- 80v tuating mechanism connected' with and driven by the main-shaft and ada ted to inipart to the loo -taker shaft' ap urality of? rotations for eac rotation of the main-shaft, a needle-bar mounted iniixed bearings Ain h said .bracket-arm', means connected with said main-shaft for reciprocating said needle-bar a needle carrier pivotally mounted upon and movable with said 'needle bar, a' needle mounted in said carrier 'and lmovable with 90 the saine laterally toward and away from the path of movement of the point of said looptaker, an'awl carried by said needle-bar and disposed rearwardv of said needle, feeding mechanism operative in a direction transverse to the plane of lateral movement of said needle, a cam mounted on the bracket- 'A arm of the machine and operatiyely connected withv said main-shaft, 'connections intermediate said cam and needle-'carrier for 100 imparting to the needle its lateral movements, and connections from said cam to the feeding mechanism for imparting to the latter both `feeding and rising and falling movements. 105 Intestiniony whereof, I have signed 4 naine to this specification, in the presence of two subscribing witnesses.

' MARTIN HEMLEB.

Witnesses: y i

HENRY J. MILLER, HENRY'A. KQRNEMANN.

a bed-plate an an 75v 

